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Merge pull request #9653 from anmoldeep0123/BAEL_4302

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BAEL-4302 : How can I list all classes loaded in a specific class loader
This commit is contained in:
davidmartinezbarua 2020-08-16 11:52:41 -03:00 committed by GitHub
commit a3ccd178e1
3 changed files with 60 additions and 0 deletions
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19
core-java-modules/core-java-jvm-2/src/main/java/com/baeldung/loadedclasslisting/Launcher.java Normal file
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package com.baeldung.loadedclasslisting;
import java.util.Arrays;
public class Launcher {
public static void main(String[] args) {
printClassesLoadedBy("BOOTSTRAP");
printClassesLoadedBy("SYSTEM");
printClassesLoadedBy("EXTENSION");
}
private static void printClassesLoadedBy(String classLoaderType) {
System.out.println(classLoaderType + " ClassLoader : ");
Class<?>[] classes = ListLoadedClassesAgent.listLoadedClasses(classLoaderType);
Arrays.asList(classes)
.forEach(clazz -> System.out.println(clazz.getCanonicalName()));
}
}

40
core-java-modules/core-java-jvm-2/src/main/java/com/baeldung/loadedclasslisting/ListLoadedClassesAgent.java Normal file
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package com.baeldung.loadedclasslisting;
import java.lang.instrument.Instrumentation;
public class ListLoadedClassesAgent {
private static Instrumentation instrumentation;
public static void premain(String agentArgs, Instrumentation instrumentation) {
ListLoadedClassesAgent.instrumentation = instrumentation;
}
public static Class<?>[] listLoadedClasses(String classLoaderType) {
if (instrumentation == null) {
throw new IllegalStateException(
"ListLoadedClassesAgent is not initialized.");
}
return instrumentation.getInitiatedClasses(
getClassLoader(classLoaderType));
}
private static ClassLoader getClassLoader(String classLoaderType) {
ClassLoader classLoader = null;
switch (classLoaderType) {
case "SYSTEM":
classLoader = ClassLoader.getSystemClassLoader();
break;
case "EXTENSION":
classLoader = ClassLoader.getSystemClassLoader().getParent();
break;
// passing a null value to the Instrumentation : getInitiatedClasses method
// defaults to the bootstrap class loader
case "BOOTSTRAP":
break;
default:
break;
}
return classLoader;
}
}

1
core-java-modules/core-java-jvm-2/src/main/java/com/baeldung/loadedclasslisting/MANIFEST.MF Normal file
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Premain-Class: com.baeldung.loadedclasslisting.ListLoadedClassesAgent